How do I cancel my O2 subscription to Cafeyn? In order to cancel your subscription, you need to contact directly O2 at www.o2.co.uk/contactus or by calling 202 from your O2 mobile or 03448090202 from a landline. Cafeyn will not be able to cancel it for you. Related articles What does my subscription include? How can I cancel my subscription? If I move to the O2 chargeable subscription will the catalogue stay the same? If I am an existing Cafeyn subscriber, can I still redeem this offer? What is Cafeyn?